TWI554416B - Height adjustment device - Google Patents

Description

Vehicle height adjustment device

The present invention relates to a vehicle height adjusting device.

Generally, between the vehicle body and the wheel in the vehicle, a coil spring or an air spring called a suspension spring that elastically supports the vehicle body is mounted. The suspension spring absorbs the impact caused by the unevenness of the road surface.

In a vehicle, if there are many loads or passengers, the amount of compression of the suspension spring becomes large. As a result, there is a case where the vehicle height becomes too low. Conversely, if the load or the number of passengers is small, the amount of compression of the suspension spring becomes small. As a result, there is a case where the vehicle height becomes too high. Therefore, as disclosed in JP2010-149550A, there is a case where the vehicle height adjusting device for adjusting the vehicle height is mounted on the vehicle. The vehicle height adjusting device supports a spring receiving portion that supports one side end portion of the suspension spring by using a jack chamber that fills the actuating fluid. Further, in the jacking chamber, a pump is supplied or discharged by a pump to thereby raise and lower the spring receiving portion to adjust the vehicle height.

In the above-described vehicle height adjusting device, there is a case where the landing height of the foot is easily lowered when the vehicle is lowered, and the foot is easily stepped on the ground. Such a situation is, for example, the case where the above-described vehicle height adjusting device is used for a rear suspension of a two-wheeled vehicle. However, the pump of the vehicle height adjusting device described in JP2010-149550A drives the piston (the piston 11 of JP2010-149550A) with a motor. Further, the operating fluid is supplied or discharged to the jacking chamber by the reciprocating motion of the piston. Therefore, if the motor is not driven by the motor in the backward direction, the vehicle height will not decrease. As a result, it is difficult to quickly lower the vehicle height when parking, and the foot landing property is improved.

An object of the present invention is to provide a vehicle height adjusting device which can quickly lower the vehicle height and improve the landing performance of the foot during parking.

A vehicle height adjusting device according to an aspect of the present invention is mounted on a vehicle and adjusts a vehicle height, and includes a suspension spring that elastically supports the vehicle body, a spring receiving portion that supports one side end portion of the suspension spring, and a filling actuating fluid. a jacking chamber supporting the spring receiving portion, and a fluid pressure driving unit that supplies or discharges the operating fluid to the jacking chamber and raises and lowers the spring receiving portion; the fluid pressure driving unit includes a first flow path and a second flow path, a pump that selectively supplies the operating fluid to the first flow path or the second flow path, and a tank that is connected to the first flow path or the second flow path that does not receive the supply of the operating fluid from the pump; The vehicle height adjusting device further includes a valve body that connects the first flow path and the jacking flow path of the jacking chamber, and that can open and close the plugging flow path, and biases the valve in a direction to block the jacking flow path A body spring and a pilot line that causes the pressure of the second flow path to act on the valve body to open the jacking flow path.

B‧‧‧ bracket

D‧‧‧buffer

G‧‧‧ Guide tube

H‧‧‧shell

J‧‧‧Car height adjustment device

K‧‧‧ cabinet

M‧‧‧ forward and reverse rotation motor

P‧‧‧ jack up piston

U‧‧‧Fluid pressure drive unit

S1‧‧‧suspension spring

S2, S3‧‧ ‧ spring bearing

A1‧‧‧ cylinder

A2‧‧‧Piston

A3‧‧‧ pole

K1‧‧‧ containment room

K10‧‧‧ small diameter room

K11‧‧‧ Large diameter room

o‧‧‧First flow side opening

V1‧‧‧ switching valve

V10‧‧‧ valve body

V10a‧‧‧ first connected position

V10b‧‧‧ occlusion position

V10c‧‧‧second connected position

V11, v12‧‧ spring

V13‧‧‧First guiding line

V14‧‧‧Second guiding line

V2‧‧‧ operation check valve

V20‧‧‧First check valve

V21‧‧‧second check valve

V22‧‧‧First guiding line

V23‧‧‧Second guiding line

V3, V4‧‧‧ slow return valve

V5, V6, V7, V8‧‧‧ release valves

D1‧‧‧Outer tube

D2‧‧‧ piston rod

H1‧‧‧Hose

R1‧‧‧Seal

1‧‧‧ jacking room

2‧‧‧First flow path

3‧‧‧Second flow path

4‧‧‧ pump

4a, 4b‧‧‧ spitting

5‧‧‧ slots

50, 51, 52, 53‧‧ ‧ release flow path

6‧‧‧Upstream flow path

7‧‧‧ valve body

7a‧‧‧ head

7b‧‧‧First Piston

7c‧‧‧Second Piston

7d, 7f‧‧ ‧ step surface

7e‧‧‧stop

8‧‧‧ Spring

9‧‧‧Guidance line

10, 70‧‧‧ first room

11, 71‧‧‧ second room

Fig. 1 is a schematic view showing a vehicle height adjusting device according to an embodiment of the present invention.

Fig. 2 is a view showing a mounted state of a vehicle height adjusting device according to an embodiment of the present invention.

Fig. 3 is a schematic view showing a state in which a fluid pressure driving unit is connected to a cylinder device.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The same symbols are used in some drawings to indicate the same parts or corresponding parts.

As shown in Fig. 1, the vehicle height adjusting device J of the present embodiment includes a suspension spring S1 that elastically supports the vehicle body, a spring receiving portion S2 that supports one end portion of the suspension spring S1, and a filling actuating fluid and supports the spring receiving portion S2. The jacking chamber 1 and the fluid pressure driving unit U that supplies or discharges the operating fluid to the jacking chamber 1 and raises and lowers the spring receiving portion S2. The fluid pressure driving unit U includes a first flow path 2 and a second flow path 3, a pump 4 that selectively supplies the working fluid to the first flow path 2 or the second flow path 3, and a supply of the actuating fluid that is not received from the pump 4. The first flow path 2 or the second flow path 3 is connected to the groove 5.

The vehicle height adjusting device J further includes a jacking flow path 6 that connects the first flow path 2 and the jacking chamber 1, a valve body 7 that can open and close the plugging flow path 6, and a direction to block the jacking flow path 6. The spring 8 of the spring valve body 7 and the guide line 9 for applying the pressure of the second flow path 3 to the valve body 7 to open the jacking flow path 6 are provided.

Hereinafter, as will be described in detail, as shown in FIG. 2, in the present embodiment, the suspension spring S1 is configured to suspend the bumper D and the rear wheel of the two-wheeled vehicle after suspension. The damper D is provided with an outer cylinder d1 and a piston rod d2 that enters the outer cylinder d1. The damper D causes a damping force that suppresses the relative movement of the outer cylinder d1 and the piston rod d2 with respect to the other of the one of the outer cylinder d1 and the piston rod d2.

The suspension spring S1 is mounted between the pair of spring receiving portions S2 and S3. A spring receiving portion S2 supports the lower end portion of FIG. 2 of the suspension spring S1. The spring receiving portion S2 is attached to the outer circumference of the outer cylinder d1 to be coupled to one of the vehicle body side or the wheel side so as to be movable in the axial direction. The other spring receiving portion S3 supports the upper end portion of FIG. 2 of the suspension spring S1. The spring receiving portion S3 is fixed to the bracket B that connects the piston rod d2 to the other of the vehicle body side or the wheel side. The suspension spring S1 is pre-compressed and mounted between the spring receiving portions S2 and S3. Therefore, the reaction force of the suspension spring S1 always acts on the two spring receiving portions S2, S3.

When the external force is input from the wheel side, the outer cylinder d1 and the piston rod d2 relatively move in the axial direction with respect to one and the other, and the damper D and the suspension spring S1 expand and contract. Thereby, the rear suspension absorbs the impact caused by the unevenness of the road surface by the suspension spring S1, and the expansion and contraction movement of the suspension spring S1 accompanying the shock absorption is suppressed by the damper D. As a result, it is possible to prevent the above-described impact from being transmitted to the vehicle body.

The spring receiving portion S2 is formed in a ring shape. The spring receiving portion S2 is slidably coupled to the outer peripheral surface of the guiding cylinder G. The guide cylinder G is attached to the outer circumference of the outer cylinder d1. A bottomed cylindrical casing H is fixed to the outer circumference of the guide cylinder G and to the lower side of the spring receiving portion S2 in Fig. 2 . The casing H is formed with an annular jacking chamber 1 between the guide cylinder G and the guide cylinder G. The upper side of the jacking chamber 1 is opened in the upper side of FIG. 2, and is slidably connected to the outer peripheral surface of the guide cylinder G. The upper side is opened to cap the piston P. The piston P is jacked up and abuts against the lower surface of FIG. 2 of the spring receiving portion S2. The piston P is jacked up to support the spring receiving portion S2 by an actuating fluid composed of a non-compressible liquid filled in the jacking chamber 1. Act as a moving fluid system to move oil.

The fluid pressure driving unit U supplies or discharges an operating fluid to the jacking chamber 1. In the present embodiment, the fluid pressure driving unit U moves the spring receiving portion S2 up and down. On the right side of the center line L in Fig. 2, the state in which the spring receiving portion S2 has been raised to the maximum is indicated. The left side of the center line L in Fig. 2 indicates the state in which the spring receiving portion S2 has been lowered to the maximum. The jacking flow path 6 connected to the first flow path 2 and the guiding line 9 connected to the second flow path 3 are formed in the casing K attached to the fluid pressure driving unit U in the present embodiment. The jacking flow path 6 communicates with the jacking chamber 1 through the hose h1. The valve body 7 and the spring 8 are housed in the casing K.

Further, the fluid pressure driving unit U can selectively supply the operating fluid to the first flow path 2 or the second flow path 3 by the pump 4. The fluid pressure driving unit U is as long as it can make the pump 4 The first flow path 2 or the second flow path 3 that receives the supply of the operating fluid may be connected to the groove 5, and may have any configuration. In the present embodiment, the fluid pressure driving unit U described in the following Fig. 3 is used as it is. Specifically, as shown in FIG. 1, the pump 4 is driven by the forward/reverse rotation motor M to discharge the operating fluid in both directions. The first flow path 2 is connected to the discharge port 4a of one of the pumps 4, and the second flow path 3 is connected to the other discharge port 4b of the pump 4. The fluid pressure driving unit U is provided with a switching valve V1 for connecting the first flow path 2 or the second flow path 3 that does not receive the supply of the operating fluid from the pump 4 to the tank 5.

The switching valve V1 includes a valve body v10, a pair of springs v11 and v12, a first pilot line v13, and a second pilot line v14. The valve body v10 includes a first communication position v10a, a blocking position v10b, and a second communication position v10c. The first communication position v10a connects the first flow path 2 and the groove 5. The blocking position v10b blocks the communication between both the first flow path 2 and the second flow path 3 and the groove 5. The second communication position v10c communicates with the second flow path 3 and the groove 5. A pair of springs v11, v12 are disposed on both sides of the valve body v10 and position the valve body v10 at the blocking position v10b. The first pilot line v13 applies the pressure of the first channel 2 to the valve body v10 in such a manner as to connect the second communication position v10c. The second pilot line v14 applies the pressure of the second channel 3 to the valve body v10 in such a manner as to connect the first communication position v10a.

The switching valve V1 in the fluid pressure driving unit U is on the side of the casing K, and is provided with an operating check valve V2. The check valve V2 is provided with a first check valve v20, a second check valve v21, a first pilot line v22, and a second pilot line v23. The first check valve v20 is disposed in the middle of the first flow path 2 and allows the flow of the working fluid from the pump 4 side toward the tank K side but prevents the flow in the opposite direction. The second check valve v21 is disposed in the middle of the second flow path 3 and allows the flow of the working fluid from the pump 4 side toward the tank K side but prevents the flow in the opposite direction. First A pilot line v22 is caused to cause the pressure of the first flow path 2 to act to open the second check valve v21. The second guiding line v23 causes the pressure of the second flow path 3 to act to open the first check valve v20.

Therefore, in the case where the pump 4 is driven and the operating fluid discharged from the pump 4 is supplied to the first flow path 2, the first check valve v20 moves the first flow path 2 and allows only the side from the pump 4 side toward the case K side. Actuating the flow of fluid and preventing the flow in the opposite direction. Further, the second check valve v21 opens the second flow path 3 to allow the flow in both directions. In the case where the pump 4 is driven and the operating fluid discharged from the pump 4 is supplied to the second flow path 3, the second check valve v21 moves the second flow path 3 and allows only the side from the pump 4 side toward the casing K side. Actuating the flow of fluid and preventing the flow in the opposite direction. Further, the first check valve v20 opens the first flow path 2 to allow the flow in both directions. When the pump 4 is not driven, the two check valves v20 and v21 allow only the flow of the actuating fluid from the pump 4 side toward the tank K side through the first flow path 2 and the second flow path 3, and prevent the flow in the opposite direction.

The first flow path 2 and the second flow path 3 on the tank K side of the fluid check driving unit U are provided with slow return valves V3 and V4. The slow return valves V3, V4 narrow the flow only when the actuating fluid flows to the side of the operation check valve V2. Further, in the first flow path 2 and the second flow path 3, between the operation check valve V2 and the slow return valves V3, V4, between the operation check valve V2 and the switching valve V1, respectively, and the groove 5 are extended. The relief flow paths 50, 51, 52, 53 are connected. The release passages V5, V6, V7, and V8 are provided in the respective release passages 50, 51, 52, and 53. The release valves V5, V6, V7, and V8 are abnormal in the first flow path 2 or the second flow path 3. In the case of boosting, excess operating fluid is moved to the tank 5.

A housing chamber k1 for accommodating the valve body 7 and the spring 8 is formed in the casing K. The storage chamber k1 includes a small diameter chamber k10 and a large diameter chamber k11 that is coaxially connected to the small diameter chamber k10 and has a larger diameter to the smaller diameter chamber k10. The small diameter chamber k10 and the jacking flow path provided between the first flow path 2 and the hose h1 6 is connected midway. The large diameter chamber k11 is connected to the terminal of the guide line 9 connected to the second flow path 3.

The valve body 7 is provided with a head portion 7a, a first piston portion 7b, and a second piston portion 7c. The head portion 7a can open and close the first flow path side opening o of the small diameter chamber k10. The first piston portion 7b divides the first chamber 70 that is in sliding contact with the inner peripheral surface of the casing K and always communicates with the jacking chamber 1 into a small diameter chamber k10. The second piston portion 7c is divided into a large diameter chamber k11 by a second chamber 71 that is slidably connected to the inner circumferential surface of the casing K and that communicates with the second flow passage 3 through the guide conduit 9. A spring 8 is housed on the side opposite to the head portion of the second piston portion 7c in the large diameter chamber k11. In other words, the spring 8 is housed in the large diameter chamber k11 and is a portion opposite to the head portion 7a as viewed from the second piston portion 7c. The spring 8 springs the valve body 7 in the direction to the right side in Fig. 1, that is, the direction in which the jacking flow path 6 is blocked.

The first flow path side opening o is disposed to face the head portion 7a and holds an annular seal r1. The head portion 7a abuts against the seal r1, thereby blocking the first flow path side opening o. As a result, the jacking flow path 6 is blocked. In the head portion 7a, the pressure of the first flow path 2 acts against the spring pressure of the spring 8 and acts in the direction in which the valve body 7 is depressed. Therefore, when the pressure of the first flow path 2 is equal to or greater than a predetermined value, the head portion 7a is separated from the seal r1, and the jacking flow path 6 is released. Further, the seal r1 may be attached to the valve body 7.

The diameter of the head portion 7a is formed to have a small diameter of the smaller diameter chamber k10. The small-diameter chamber k10 has a chamber-side opening (not indicated by a symbol) and opens toward the side of the head portion 7a. Therefore, the pressure of the first chamber 70 formed on the outer circumference of the head portion 7a is always equal to the pressure of the jacking chamber 1. At the step surface 7d of the first piston portion 7b and the head portion 7a, the pressure of the jacking chamber 1 acts against the spring pressure of the spring 8 and depresses the valve body 7. Therefore, when the pressure of the jacking chamber 1 becomes a predetermined value or more, the head portion 7a is separated from the seal r1, and the jacking flow path 6 is released.

A restriction valve body 7 is disposed between the first piston portion 7b and the second piston portion 7c. A stopper 7e that moves to the right in FIG. The diameter of the stopper portion 7e is formed to have a small diameter of the larger diameter chamber k11. An opening (not indicated by a symbol) of the large diameter chamber k11 connected to the guide line 9 is opened toward the side surface of the stopper portion 7e. Therefore, the pressure of the second chamber 71 formed on the outer circumference of the stopper portion 7e is always equal to the pressure of the second flow path 3. At the step surface 7f of the second piston portion 7c and the stopper portion 7e, the pressure of the second flow path 3 passes through the guide line 9, and acts against the spring pressure of the spring 8 and moves in the direction in which the valve body 7 is pushed down. Therefore, when the pressure of the second flow path 3 becomes a predetermined value or more, the head portion 7a is separated from the seal r1, and the jacking flow path 6 is released.

Next, the operation of the vehicle height adjusting device J of the present embodiment will be described.

When the motor M is rotated forward and the operating fluid is supplied from the pump 4 to the first flow path 2, the switching valve V1 is connected to the second communication position v10c against the spring pressure of the spring v12. Further, the second check valve v21 is opened by the pressure of the first flow path 2. The second check valve v21 allows the operating fluid to move in both directions in the second flow path 3. The actuating fluid that has been discharged from the pump 4 to the first flow path 2 opens the first check valve v20 and the slow return valve V3 and flows into the jacking flow path 6. The actuating fluid that has flowed into the jacking flow path 6 releases the valve body 7 against the spring pressure of the spring 8 and liberates the jacking flow path 6. The actuating fluid that has liberated the jacking flow path 6 is supplied to the jacking chamber 1 through the first chamber 70 and the hose h1. Therefore, the jacking piston P and the spring receiving portion S2 are pushed down to raise the vehicle height. Further, the pump 4 or the second chamber 71 is supplied with the operating fluid from the tank 5 through the second flow path 3.

When the motor M is reversely rotated and the operating fluid is supplied from the pump 4 to the second flow path 3, the switching valve V1 is connected to the first communication position v10a against the spring pressure of the spring v11. Further, the first check valve v20 is opened by the pressure of the second flow path 3. The first check valve v20 allows the actuating fluid to move in both directions in the first flow path 2. The actuating fluid that has been discharged from the pump 4 to the second flow path 3 opens the second check valve v21 and the slow return valve V4 and flows into the second chamber 71 through the pilot line 9. Has The actuating fluid that has flowed into the second chamber 71 resists the spring pressure of the spring 8 and depresses the valve body 7 to liberate the jacking flow path 6. At this time, the first flow path 2 connected to the jacking flow path 6 serves as a groove pressure. Therefore, the vehicle height is lowered by pressing down the spring receiving portion S2 and lifting the piston P by the reaction force of the suspension spring S1. At this time, the actuating fluid of the jacking chamber 1 flows out through the jacking flow path 6 to the first flow path 2. Further, the pump 4 is supplied with the operating fluid from the tank 5 or the jacking chamber 1 through the first flow path 2.

Even when the motor M is not driven, once the pressure of the first chamber 70 is increased by pressurizing the jacking chamber 1 so that the thrust caused by the pressure is higher than the spring pressure of the spring 8, the valve body 7 also resists the spring pressure of the spring 8 and Being taken down, the top 6 will be liberated. At this time, since the first check valve v20 is not opened, when the pressure of the first flow path 2 on the tank K side is higher than the predetermined value than the first check valve v20, the release valve V5 is opened and the fluid is moved to The tank 5 flows out. In the same manner, when the pressure of the jacking chamber 1 is applied to the valve body 7 to open the jacking flow path 6, the operating fluid is supplied to the second chamber 71 which is enlarged as the valve body 7 retreats. Therefore, although not shown, it is preferable to provide a supply flow path in which the communication groove 5 and the second flow path 3 are provided, and only the flow of the movable fluid that moves from the groove 5 to the second flow path 3 is allowed.

Next, the effect of the vehicle height adjusting device J of the present embodiment will be described. The vehicle height adjusting device J includes a suspension spring S1 that elastically supports the vehicle body, a spring receiving portion S2 that supports one side end portion of the suspension spring S1, a jacking chamber that fills the working fluid and supports the spring receiving portion S2, and a jacking up The chamber 1 supplies or discharges the actuating fluid and causes the fluid receiving portion S2 to move up and down to drive the unit U. The fluid pressure driving unit U includes a first flow path 2 and a second flow path 3, a pump 4 that selectively supplies the working fluid to the first flow path 2 or the second flow path 3, and a supply of the actuating fluid that is not received from the pump 4. The first flow path 2 or the second flow path 3 is connected to the groove 5.

The vehicle height adjusting device J further has a communication between the first flow path 2 and the jacking chamber 1 The jacking flow path 6 opens and closes the valve body 7 of the jacking flow path 6, the spring 8 that biases the valve body 7 in the direction of blocking the jacking flow path 6, and the pressure of the second flow path 3 acts on The valve body 7 is a guide line 9 that opens the jacking flow path 6.

According to the above configuration, the pump 4 supplies the operating fluid to the second flow path 3, and the first flow path 2 is connected to the groove 5. Thereby, the pressure of the second flow path 3 can be applied to the valve body 7, and the flow path can be jacked up. 6 open. Therefore, the reaction fluid of the jacking chamber 1 can be made to flow out to the first flow path 2 which becomes the groove pressure by the reaction force of the suspension spring S1. As a result, it is possible to quickly lower the height of the vehicle and improve the landing performance of the foot during parking.

The vehicle height adjusting device J of the present embodiment has a configuration in which the pressure of the jacking chamber 1 acts to open the jacking flow path 6 in the valve body 7.

According to the above configuration, even when the pump 4 is not driven, the valve body 7 opens the jacking flow path 6 against the spring pressure of the spring 8 once the pressure of the jacking chamber 1 becomes a predetermined value or more. Therefore, the excess pressure of the jacking chamber 1 can be prevented, and the vehicle height adjusting device J can be protected.

The vehicle height adjusting device J of the present embodiment further includes a casing K that is externally attached to the fluid pressure driving unit U. Further, in the casing K, a jacking flow path 6 and a guide line 9 are formed, and a housing chamber k1 in which the valve body 7 is housed is formed.

According to the above configuration, in the case where the fluid pressure driving unit U for driving the cylinder device is present, the fluid pressure driving unit U for driving the cylinder device can be used for the vehicle height adjustment only by the rear housing K. The fluid pressure driving unit U for driving the cylinder device will be described below.

In the vehicle height adjusting device J of the present embodiment, the storage chamber k1 includes a small diameter chamber k10 and a large diameter chamber k11 which is connected to the small diameter chamber k10 and has a larger diameter to the smaller diameter chamber k10, and has a small diameter The chamber k10 is connected to the jacking flow path 6 in the middle, and the large diameter chamber k11 is connected to the terminal end of the guiding line 9. Further, the valve body 7 is provided with a head portion 7a that opens and closes the first flow path side opening o of the small-diameter chamber k10, and is slidably connected to the inner circumferential surface of the casing K and is always in communication with the jacking chamber 1. The first chamber 70 is divided into a first piston portion 7b of the small diameter chamber k10, and a second chamber 71 that is slidably connected to the inner circumferential surface of the casing K and always communicates with the second flow path 3 is divided into a large diameter chamber k11. The second piston portion 7c. Further, the spring 8 is housed in the opposite side of the second piston portion 7c of the large diameter chamber k11 from the head portion.

According to the above configuration, since the pressure of the second chamber 71 becomes the pressure of the second flow path 3, it is easier to apply the pressure of the second flow path 3 to the direction in which the jacking flow path 6 is opened to the second piston portion 7c. . Further, according to the above configuration, since the pressure of the first chamber 70 is the pressure of the jacking chamber 1, the pressure of the jacking chamber 1 is applied to the direction in which the jacking passage 6 is opened to the first piston portion 7b. It's easier.

Here, FIG. 3 shows a hydraulic circuit in the case where the fluid pressure driving unit U is driven by the cylinder device A. The fluid pressure drive unit U is connected to the cylinder device A. The fluid pressure driving unit U drives the object by expanding and contracting the cylinder device A. The cylinder device A includes a cylinder a1, a piston a2 inserted in the cylinder a1, a first chamber 10 and a second chamber 11 partitioned by the piston a2 in the cylinder a1, and a piston a2 coupled to the cylinder a1. Externally extended rod a3. In this example, the first flow path 2 is in communication with the first chamber 10, and the second flow path 3 is in communication with the second chamber 11.

The fluid pressure driving unit U supplies the operating fluid from the pump 4 to the first chamber 10 through the first flow path 2, and causes the operating fluid of the second chamber 11 to flow out to the second flow path 3 which becomes the groove pressure, thereby causing the cylinder device A to contract. . Further, the operating fluid is supplied from the pump 4 to the second chamber 11 through the second flow path 3, and the operating fluid of the first chamber 10 flows out to the first flow path 2 which becomes the groove pressure, thereby charging the cylinder Set A to stretch. The same is disclosed in JP2003-172307A and JP2008-267575A.

In the case where the fluid pressure driving unit U is applied to the vehicle height adjusting device, in the vehicle height adjusting device, the space chamber for supplying or discharging the operating fluid is only the jacking chamber. Therefore, if the fluid pressure driving unit U is to be used in the vehicle height adjusting device while maintaining the state, it is not necessary to receive one of the first flow path 2 and the second flow path 3 from the pump 4 for supplying the operating fluid. As a result, the first flow path 2 and the second flow path 3 cannot be fully utilized. The same example is disclosed in Figure 2 of JP2008-267575A.

The vehicle height adjusting device J of the present embodiment is provided with the jacking flow path 6 connected to the first flow path 2 and the fluid pressure driving unit U for driving the cylinder device shown in FIG. Since the second flow path 3 is connected to the guide line 9, the actuating fluid can be supplied or discharged to the jacking chamber 1 by both the first flow path 2 and the second flow path 3.

Although the embodiment of the present invention has been described above, the above embodiment is only a part of the application example of the present invention, and the technical scope of the present invention is not intended to be limited to the specific configuration of the above embodiment.

For example, in the above embodiment, the vehicle height adjusting device J is used for rear suspension of the rear wheel of the suspension two-wheeled vehicle, but it can also be used for other vehicles.

In the above embodiment, the casing K attached to the fluid pressure driving unit U is provided, and the jacking flow path 6 or the guide line 9 is formed in the casing K, and the valve body 7 and the spring 8 are housed. A jacking flow path 6 or a guide line 9 may be formed in the fluid pressure driving unit U, and the valve body 7 and the spring 8 may be housed.

The shape or configuration of the accommodating chamber k1 or the valve body 7 is not limited to the above, and it is possible to cause the pressure of the second flow path 3 to be at least openably closed so that the pressure of the second flow path 3 is opened. When the valve body 7 of the flow path 6 is jacked up, an appropriate shape or configuration can be selected.

The present application claims priority to Japanese Patent Application No. 2013-051844, filed on Jan.

J‧‧‧Car height adjustment device

K‧‧‧ cabinet

M‧‧‧ forward and reverse rotation motor

U‧‧‧Fluid pressure drive unit

S1‧‧‧suspension spring

S2‧‧ ‧ spring bearing

K1‧‧‧ containment room

K10‧‧‧ small diameter room

K11‧‧‧ Large diameter room

o‧‧‧First flow side opening

V1‧‧‧ switching valve

V10‧‧‧ valve body

V10a‧‧‧ first connected position

V10b‧‧‧ occlusion position

V10c‧‧‧second connected position

V11, v12‧‧ spring

V13‧‧‧First guiding line

V14‧‧‧Second guiding line

V2‧‧‧ operation check valve

V20‧‧‧First check valve

V21‧‧‧second check valve

V22‧‧‧First guiding line

V23‧‧‧Second guiding line

V3, V4‧‧‧ slow return valve

V5, V6, V7, V8‧‧‧ release valves

H1‧‧‧Hose

R1‧‧‧Seal

1‧‧‧ jacking room

2‧‧‧First flow path

3‧‧‧Second flow path

4‧‧‧ pump

4a, 4b‧‧‧ spitting

5‧‧‧ slots

50, 51, 52, 53‧‧ ‧ release flow path

6‧‧‧Upstream flow path

7‧‧‧ valve body

7a‧‧‧ head

7b‧‧‧First Piston

7c‧‧‧Second Piston

7d, 7f‧‧ ‧ step surface

7e‧‧‧stop

8‧‧‧ Spring

9‧‧‧Guidance line

70‧‧‧First Room

71‧‧‧ second room

Claims (4)

A vehicle height adjusting device is mounted on a vehicle and is configured to adjust a vehicle height, and is characterized in that: a suspension spring that elastically supports the vehicle body, a spring receiving portion that supports one side end portion of the suspension spring, and an actuating fluid are filled and supported a jacking chamber of the spring receiving portion, and a fluid pressure driving unit that supplies or discharges the operating fluid to the jacking chamber and raises and lowers the spring receiving portion; the fluid pressure driving unit includes: a first flow path and a second flow path; a pump that selectively supplies the actuating fluid to the first flow path or the second flow path, and a groove that is connected to the first flow path or the second flow path that does not receive the supply of the operating fluid from the pump; the vehicle height adjustment Further, the apparatus further includes: a valve body that communicates with the jacking passage of the first flow path and the jacking chamber, and a valve body that can open and close the plugging flow path, and biases the valve body in a direction to block the jacking flow path A spring and a guiding line that causes the pressure of the second flow path to act on the valve body to open the jacking flow path. The vehicle height adjusting device of claim 1, wherein in the valve body, the pressure of the jacking chamber acts to open the jacking flow path. The vehicle height adjusting device of claim 1, further comprising a casing attached to the fluid pressure driving unit; The jacking flow path and the guiding duct are formed in the casing, and a receiving chamber for accommodating the valve body is formed. The vehicle height adjusting device of claim 3, wherein the storage room is provided with a small diameter chamber and a large diameter chamber connected to the small diameter chamber and having a larger diameter than the small diameter chamber; the small diameter chamber And connecting to the terminal of the jacking flow path, wherein the large diameter chamber is connected to the terminal end of the guiding line; the valve body is provided with a head that can openably and closably open the first flow path side opening of the small diameter chamber, a first chamber portion that is slidably connected to the inner circumferential surface of the casing and that is always in communication with the ejector chamber is partitioned into a first piston portion of the small diameter chamber, and is slidably coupled to the inner circumferential surface of the casing and is always The second chamber communicating with the second flow path is divided into a second piston portion of the large diameter chamber; the spring is received on the opposite side of the second piston portion of the large diameter chamber from the head portion.